jdk8-mips64-public/hotspot: src/cpu/sparc/vm/vtableStubs

src/cpu/sparc/vm/vtableStubs_sparc.cpp@891687731b59 (annotated)

src/cpu/sparc/vm/vtableStubs_sparc.cpp

Tue, 24 Sep 2013 15:56:25 +0200

author: anoll
date: Tue, 24 Sep 2013 15:56:25 +0200
changeset 5762: 891687731b59
parent 5694: 7944aba7ba41
child 6876: 710a3c8b516e
child 8997: f8a45a60bc6b
permissions: -rw-r--r--

7009641: Don't fail VM when CodeCache is full
Summary: Allocation in the code cache returns NULL instead of failing the entire VM
Reviewed-by: kvn, iveresov

 /*
  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "asm/macroAssembler.inline.hpp"
 #include "code/vtableStubs.hpp"
 #include "interp_masm_sparc.hpp"
 #include "memory/resourceArea.hpp"
 #include "oops/instanceKlass.hpp"
 #include "oops/klassVtable.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "vmreg_sparc.inline.hpp"
 #ifdef COMPILER2
 #include "opto/runtime.hpp"
 #endif
 // machine-dependent part of VtableStubs: create vtableStub of correct size and
 // initialize its code
 #define __ masm->
 #ifndef PRODUCT
 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oopDesc* receiver, int index);
 #endif
 // Used by compiler only; may use only caller saved, non-argument registers
 // NOTE:  %%%% if any change is made to this stub make sure that the function
 //             pd_code_size_limit is changed to ensure the correct size for VtableStub
 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
   const int sparc_code_length = VtableStub::pd_code_size_limit(true);
   VtableStub* s = new(sparc_code_length) VtableStub(true, vtable_index);
   // Can be NULL if there is no free space in the code cache.
   if (s == NULL) {
     return NULL;
   }
   ResourceMark rm;
   CodeBuffer cb(s->entry_point(), sparc_code_length);
   MacroAssembler* masm = new MacroAssembler(&cb);
 #ifndef PRODUCT
   if (CountCompiledCalls) {
     __ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), G5, G3_scratch);
   }
 #endif /* PRODUCT */
   assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
   // get receiver klass
   address npe_addr = __ pc();
   __ load_klass(O0, G3_scratch);
   // set Method* (in case of interpreted method), and destination address
 #ifndef PRODUCT
   if (DebugVtables) {
     Label L;
     // check offset vs vtable length
     __ ld(G3_scratch, InstanceKlass::vtable_length_offset()*wordSize, G5);
     __ cmp_and_br_short(G5, vtable_index*vtableEntry::size(), Assembler::greaterUnsigned, Assembler::pt, L);
     __ set(vtable_index, O2);
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), O0, O2);
     __ bind(L);
   }
 #endif
   __ lookup_virtual_method(G3_scratch, vtable_index, G5_method);
 #ifndef PRODUCT
   if (DebugVtables) {
     Label L;
     __ br_notnull_short(G5_method, Assembler::pt, L);
     __ stop("Vtable entry is ZERO");
     __ bind(L);
   }
 #endif
   address ame_addr = __ pc();  // if the vtable entry is null, the method is abstract
                                // NOTE: for vtable dispatches, the vtable entry will never be null.
   __ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3_scratch);
   // jump to target (either compiled code or c2iadapter)
   __ JMP(G3_scratch, 0);
   // load Method* (in case we call c2iadapter)
   __ delayed()->nop();
   masm->flush();
   if (PrintMiscellaneous && (WizardMode || Verbose)) {
     tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d",
                   vtable_index, s->entry_point(),
                   (int)(s->code_end() - s->entry_point()),
                   (int)(s->code_end() - __ pc()));
   }
   guarantee(__ pc() <= s->code_end(), "overflowed buffer");
   // shut the door on sizing bugs
   int slop = 2*BytesPerInstWord;  // 32-bit offset is this much larger than a 13-bit one
   assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add");
   s->set_exception_points(npe_addr, ame_addr);
   return s;
 }
 // NOTE:  %%%% if any change is made to this stub make sure that the function
 //             pd_code_size_limit is changed to ensure the correct size for VtableStub
 VtableStub* VtableStubs::create_itable_stub(int itable_index) {
   const int sparc_code_length = VtableStub::pd_code_size_limit(false);
   VtableStub* s = new(sparc_code_length) VtableStub(false, itable_index);
   // Can be NULL if there is no free space in the code cache.
   if (s == NULL) {
     return NULL;
   }
   ResourceMark rm;
   CodeBuffer cb(s->entry_point(), sparc_code_length);
   MacroAssembler* masm = new MacroAssembler(&cb);
   Register G3_Klass = G3_scratch;
   Register G5_interface = G5;  // Passed in as an argument
   Label search;
   // Entry arguments:
   //  G5_interface: Interface
   //  O0:           Receiver
   assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
   // get receiver klass (also an implicit null-check)
   address npe_addr = __ pc();
   __ load_klass(O0, G3_Klass);
   // Push a new window to get some temp registers.  This chops the head of all
   // my 64-bit %o registers in the LION build, but this is OK because no longs
   // are passed in the %o registers.  Instead, longs are passed in G1 and G4
   // and so those registers are not available here.
   __ save(SP,-frame::register_save_words*wordSize,SP);
 #ifndef PRODUCT
   if (CountCompiledCalls) {
     __ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), L0, L1);
   }
 #endif /* PRODUCT */
   Label throw_icce;
   Register L5_method = L5;
   __ lookup_interface_method(// inputs: rec. class, interface, itable index
                              G3_Klass, G5_interface, itable_index,
                              // outputs: method, scan temp. reg
                              L5_method, L2, L3,
                              throw_icce);
 #ifndef PRODUCT
   if (DebugVtables) {
     Label L01;
     __ br_notnull_short(L5_method, Assembler::pt, L01);
     __ stop("Method* is null");
     __ bind(L01);
   }
 #endif
   // If the following load is through a NULL pointer, we'll take an OS
   // exception that should translate into an AbstractMethodError.  We need the
   // window count to be correct at that time.
   __ restore(L5_method, 0, G5_method);
   // Restore registers *before* the AME point.
   address ame_addr = __ pc();   // if the vtable entry is null, the method is abstract
   __ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3_scratch);
   // G5_method:  Method*
   // O0:         Receiver
   // G3_scratch: entry point
   __ JMP(G3_scratch, 0);
   __ delayed()->nop();
   __ bind(throw_icce);
   AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry());
   __ jump_to(icce, G3_scratch);
   __ delayed()->restore();
   masm->flush();
   if (PrintMiscellaneous && (WizardMode || Verbose)) {
     tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d",
                   itable_index, s->entry_point(),
                   (int)(s->code_end() - s->entry_point()),
                   (int)(s->code_end() - __ pc()));
   }
   guarantee(__ pc() <= s->code_end(), "overflowed buffer");
   // shut the door on sizing bugs
   int slop = 2*BytesPerInstWord;  // 32-bit offset is this much larger than a 13-bit one
   assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add");
   s->set_exception_points(npe_addr, ame_addr);
   return s;
 }
 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
   if (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) return 1000;
   else {
     const int slop = 2*BytesPerInstWord; // sethi;add  (needed for long offsets)
     if (is_vtable_stub) {
       // ld;ld;ld,jmp,nop
       const int basic = 5*BytesPerInstWord +
                         // shift;add for load_klass (only shift with zero heap based)
                         (UseCompressedClassPointers ?
                           MacroAssembler::instr_size_for_decode_klass_not_null() : 0);
       return basic + slop;
     } else {
       const int basic = (28 LP64_ONLY(+ 6)) * BytesPerInstWord +
                         // shift;add for load_klass (only shift with zero heap based)
                         (UseCompressedClassPointers ?
                           MacroAssembler::instr_size_for_decode_klass_not_null() : 0);
       return (basic + slop);
     }
   }
   // In order to tune these parameters, run the JVM with VM options
   // +PrintMiscellaneous and +WizardMode to see information about
   // actual itable stubs.  Look for lines like this:
   //   itable #1 at 0x5551212[116] left over: 8
   // Reduce the constants so that the "left over" number is 8
   // Do not aim at a left-over number of zero, because a very
   // large vtable or itable offset (> 4K) will require an extra
   // sethi/or pair of instructions.
   //
   // The JVM98 app. _202_jess has a megamorphic interface call.
   // The itable code looks like this:
   // Decoding VtableStub itbl[1]@16
   //   ld  [ %o0 + 4 ], %g3
   //   save  %sp, -64, %sp
   //   ld  [ %g3 + 0xe8 ], %l2
   //   sll  %l2, 2, %l2
   //   add  %l2, 0x134, %l2
   //   and  %l2, -8, %l2        ! NOT_LP64 only
   //   add  %g3, %l2, %l2
   //   add  %g3, 4, %g3
   //   ld  [ %l2 ], %l5
   //   brz,pn   %l5, throw_icce
   //   cmp  %l5, %g5
   //   be  %icc, success
   //   add  %l2, 8, %l2
   // loop:
   //   ld  [ %l2 ], %l5
   //   brz,pn   %l5, throw_icce
   //   cmp  %l5, %g5
   //   bne,pn   %icc, loop
   //   add  %l2, 8, %l2
   // success:
   //   ld  [ %l2 + -4 ], %l2
   //   ld  [ %g3 + %l2 ], %l5
   //   restore  %l5, 0, %g5
   //   ld  [ %g5 + 0x44 ], %g3
   //   jmp  %g3
   //   nop
   // throw_icce:
   //   sethi  %hi(throw_ICCE_entry), %g3
   //   ! 5 more instructions here, LP64_ONLY
   //   jmp  %g3 + %lo(throw_ICCE_entry)
   //   restore
 }
 int VtableStub::pd_code_alignment() {
   // UltraSPARC cache line size is 8 instructions:
   const unsigned int icache_line_size = 32;
   return icache_line_size;
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/sparc/vm/vtableStubs_sparc.cpp@891687731b59 (annotated)

src/cpu/sparc/vm/vtableStubs_sparc.cpp